Patents by Inventor Nobutaka Akashi

Nobutaka Akashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20170346017
    Abstract: A nitrogen-containing compound and an organic electroluminescence device including the same, the nitrogen-containing compound being represented by the following Formula 1:
    Type: Application
    Filed: December 14, 2016
    Publication date: November 30, 2017
    Inventors: Hiromi NAKANO, Shuri SATO, Yoshimasa FUJITA, Nobutaka AKASHI, Takuma YASUDA, Inseob PARK
  • Patent number: 9590186
    Abstract: A material for an organic electroluminescent device having high emission efficiency and long life and an organic electroluminescent device including the same. The material for an organic electroluminescent device is represented by the following Formula 5.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: March 7, 2017
    Assignee: Samsung Display Co., Ltd.
    Inventors: Hiroaki Itoi, Ichinori Takada, Koushin Matsuoka, Masatsugu Ueno, Naoya Sakamoto, Hiromi Nakano, Nobutaka Akashi, Hideo Miyake, Xiulan Jin, Asami Sakamoto, Junta Fuchiwaki
  • Publication number: 20160197283
    Abstract: A material for an organic electroluminescent device having high emission efficiency and long life and an organic electroluminescent device including the same. The material for an organic electroluminescent device is represented by the following Formula 1.
    Type: Application
    Filed: March 10, 2016
    Publication date: July 7, 2016
    Inventors: Hiroaki Itoi, Ichinori Takada, Koushin Matsuoka, Masatsugu Ueno, Naoya Sakamoto, Hiromi Nakano, Nobutaka Akashi, Hideo Miyake, Xiulan Jin, Asami Sakamoto, Junta Fuchiwaki
  • Publication number: 20160190487
    Abstract: The material for an organic electroluminescent device includes a monoamine derivative represented by Formula 1. An organic electroluminescent device including the material can exhibit low driving voltage and improved emission efficiency. The material can be included in at least one layer positioned between an emission layer and an anode of the organic electroluminescent device.
    Type: Application
    Filed: November 13, 2015
    Publication date: June 30, 2016
    Inventors: Nobutaka Akashi, Masatsugu Ueno
  • Publication number: 20160133850
    Abstract: An organic electroluminescent device of which emission life may be improved. The organic electroluminescent device includes an anode, an emission layer, and an anode-side hole transport layer provided between the anode and the emission layer and including an anode-side hole transport material. An electron accepting material is doped in the anode-side hole transport layer. An intermediate hole transport material layer is provided between the anode-side hole transport layer and the emission layer and includes an intermediate hole transport material, and an emission layer-side hole transport layer is provided between the intermediate hole transport material layer and the emission layer and adjacent to the emission layer. The emission layer-side hole transport layer includes an emission layer-side hole transport material represented by the following Formula 1.
    Type: Application
    Filed: November 5, 2015
    Publication date: May 12, 2016
    Inventors: Toshiyuki Matsuura, Hiroaki Itoi, Naoya Sakamoto, Nobutaka Akashi
  • Publication number: 20160118597
    Abstract: A material for an organic electroluminescent device having high emission efficiency and long life and an organic electroluminescent device including the same. The material for an organic electroluminescent device is represented by the following Formula 5.
    Type: Application
    Filed: October 27, 2015
    Publication date: April 28, 2016
    Inventors: Hiroaki Itoi, Ichinori Takada, Koushin Matsuoka, Masatsugu Ueno, Naoya Sakamoto, Hiromi Nakano, Nobutaka Akashi, Hideo Miyake, Xiulan Jin, Asami Sakamoto, Junta Fuchiwaki
  • Publication number: 20160099420
    Abstract: An organic electroluminescent (EL) material and an organic EL device, the material being represented by the following Formula 1:
    Type: Application
    Filed: October 5, 2015
    Publication date: April 7, 2016
    Inventors: Hiroaki ITOI, Nobutaka AKASHI
  • Patent number: 9269913
    Abstract: A copper(I) complex is represented by the following Formula (1): [Cua(XS)b(L)c], wherein, L is triphenylphosphine, acetonitrile, tri-iso-butylphosphine, or a substituted or unsubstituted heterocyclic compound having 5 to 18 carbon atoms, a is an integer from 2 to 6, b is an integer from 2 to 6, c is an integer from 0 to 6, X is a substituted or unsubstituted aryl group, substituted or unsubstituted carbazole, or PR3, where R is a substituted or unsubstituted phenyl group or a substituted or unsubstituted cyclohexyl group.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: February 23, 2016
    Assignees: SAMSUNG DISPLAY CO., LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
    Inventors: Nobutaka Akashi, Masako Kato, Atsushi Kobayashi, Kotaro Shimada, Hiroki Ohara
  • Patent number: 9214638
    Abstract: A material for an organic electroluminescent (EL) device includes a copper(I) complex represented by the following Formula 1: [CuX(PPh3)2L]??[Formula 1] In the above Formula 1, X is an anion, PPh3 is triphenylphosphine, and L is a substituted or unsubstituted heterocyclic ligand having 5 to 18 ring carbon.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: December 15, 2015
    Assignees: SAMSUNG DISPLAY CO., LTD., NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
    Inventors: Nobutaka Akashi, Masako Kato, Hiroki Ohara, Atsushi Kobayashi
  • Publication number: 20150280148
    Abstract: A material for an organic electroluminescent (EL) device includes a copper(I) complex represented by the following Formula 1: [CuX(PPh3)2L]??[Formula 1] In the above Formula 1, X is an anion, PPh3 is triphenylphosphine, and L is a substituted or unsubstituted heterocyclic ligand having 5 to 18 ring carbon.
    Type: Application
    Filed: March 25, 2015
    Publication date: October 1, 2015
    Inventors: Nobutaka AKASHI, Masako KATO, Hiroki Ohara, Atsushi Kobayashi
  • Publication number: 20150011765
    Abstract: A copper(I) complex is represented by the following Formula (1): [Cua(XS)b(L)c], wherein, L is triphenylphosphine, acetonitrile, tri-iso-butylphosphine, or a substituted or unsubstituted heterocyclic compound having 5 to 18 carbon atoms, a is an integer from 2 to 6, b is an integer from 2 to 6, c is an integer from 0 to 6, X is a substituted or unsubstituted aryl group, substituted or unsubstituted carbazole, or PR3, where R is a substituted or unsubstituted phenyl group or a substituted or unsubstituted cyclohexyl group.
    Type: Application
    Filed: July 3, 2014
    Publication date: January 8, 2015
    Applicant: HOKKAIDO UNIVERSITY
    Inventors: Nobutaka AKASHI, Masako KATO, Atsushi KOBAYASHI, Koutarou SHIMADA, Yuki OHARA
  • Publication number: 20140239229
    Abstract: An organic electroluminescence (EL) device comprising an organic EL material represented by the following Formula (1):
    Type: Application
    Filed: February 25, 2014
    Publication date: August 28, 2014
    Applicant: SAMSUNG DISPLAY CO., LTD.
    Inventors: Nobutaka AKASHI, Toshiaki MURAI
  • Patent number: 8043725
    Abstract: The invention provides an organic electroluminescence element which comprises a hole transporting layer which comprises a tris(p-terphenyl-4-yl)amine represented by the general formula (I) wherein R1, R2 and R3 are each independently a hydrogen atom, an alkyl group, a cycloalkyl group which may have substituents or an aryl group which may have substituents as a hole transporting agent, and a hole injecting layer which comprises a hole injecting agent comprising an aromatic tertiary amine having an ionization potential in the range of 5.2-5.6 eV. This organic electroluminescence element can be driven at a low voltage with high efficiency and at high luminance.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: October 25, 2011
    Assignee: Bando Chemical Industries, Ltd.
    Inventors: Tomokazu Kobata, Nobutaka Akashi
  • Patent number: 8029920
    Abstract: The invention provides a 1,3,5-tris(diarylamino)benzene represented by the general formula (I) wherein A and B are each independently a group represented by the general formula (II) in which R is a hydrogen atom, an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbons and n is 0, 1, 2 or 3, provided that the values of n of A and B are not the same to each other. Such a 1,3,5-tris(diarylamino)benzene is able to form an amorphous film by vacuum evaporation at a relatively low temperature with almost or substantially no thermal decomposition, and is preferably used as organo-electronic functional material, in particular, as a hole injecting agent or a hole transporting agent.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: October 4, 2011
    Assignee: Bando Chemical Industries, Ltd
    Inventors: Nobutaka Akashi, Hideyuki Katou
  • Publication number: 20110186834
    Abstract: The invention provides a 1,3,5-tris(diarylamino)benzene represented by the general formula (I) in which R1 to R6 are each independently a group which is represented by the general formula (II) wherein R is independently a hydrogen atom, an alkyl group of 1 to 6 carbon atoms or a cycloalkyl group of 5 or 6 carbon atoms, m is 2, 3, 4 or 5, and n is 0, 1 or 2, provided that at least one of R1 to R6 is independently a group represented by the general formula (II) wherein R is an alkyl group of 1 to 6 carbon atoms or a cycloalkyl group of 5 or 6 carbon atoms, m is 2, 3, 4 or 5, and n is 0, 1 or 2.
    Type: Application
    Filed: August 28, 2009
    Publication date: August 4, 2011
    Applicant: BANDO CHEMICAL INDUSTRIES, LTD.
    Inventors: Masashi Ohta, Nobutaka Akashi
  • Publication number: 20100006828
    Abstract: The invention provides an organic electroluminescence element which comprises a hole transporting layer which comprises a tris(p-terphenyl-4-yl)amine represented by the general formula (I) wherein R1, R2 and R3 are each independently a hydrogen atom, an alkyl group, a cycloalkyl group which may have substituents or an aryl group which may have substituents as a hole transporting agent, and a hole injecting layer which comprises a hole injecting agent comprising an aromatic tertiary amine having an ionization potential in the range of 5.2-5.6 eV. This organic electroluminescence element can be driven at a low voltage with high efficiency and at high luminance.
    Type: Application
    Filed: July 20, 2007
    Publication date: January 14, 2010
    Applicant: Bando Chemical Industrial, Ltd.
    Inventors: Tomokazu Kobata, Nobutaka Akashi
  • Patent number: 7629059
    Abstract: The invention provides an organo-electronic functional material comprising a tris(arylamino)benzene represented by the general formula (I) wherein A and B are each a group represented by the general formula (II) in which R is an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbon atoms and n is 0, 1, 2 or 3, and A and B may be the same or different from each other, and exhibiting a cyclic voltamogram in which a deviation of peak current of cyclic curves as measured 50 times at a sweep rate of 20 mV/s falls within ±10% of the average of peak current. The organo-electronic functional material has an opto-electronic exchanging function, a reversible oxidation-reduction property and a high glass transition temperature, and can form amorphous film in itself.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: December 8, 2009
    Assignee: Bando Chemical Industries, Ltd.
    Inventors: Nobutaka Akashi, Yasuhiko Shirota
  • Publication number: 20090066222
    Abstract: The invention provides an organic electronic functional material which comprises a 1,3,5-tris(4-(N,N-diarylamino)phenyl)benzene represented by the general formula (I) wherein A and B are each preferably a phenyl group having an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbons at the 4-position.
    Type: Application
    Filed: October 31, 2005
    Publication date: March 12, 2009
    Applicant: BANDO CHEMICAL INDUSTRIES, LTD.
    Inventors: Nobutaka Akashi, Kaori Inayama, Hiroshi Inada, Yasuhiko Shirota
  • Publication number: 20090058287
    Abstract: The invention provides a 1,3,5-tris(diarylamino)benzene represented by the general formula (I) wherein A and B are each independently a group represented by the general formula (II) in which R is a hydrogen atom, an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbons and n is 0, 1, 2 or 3, provided that the values of n of A and B are not the same to each other. Such a 1,3,5-tris(diarylamino)benzene is able to form an amorphous film by vacuum evaporation at a relatively low temperature with almost or substantially no thermal decomposition, and is preferably used as organo-electronic functional material, in particular, as a hole injecting agent or a hole transporting agent.
    Type: Application
    Filed: March 8, 2007
    Publication date: March 5, 2009
    Applicant: BANDO CHEMICAL INDUSTRIES, LTD.
    Inventors: Nobutaka Akashi, Hideyuki Katou
  • Patent number: 7271291
    Abstract: The invention provides 1,3,5-tris(arylamino)benzenes represented by the general formula (I) wherein A is naphthyl, anthryl or phenanthryl group, and R is hydrogen atom or diarylamino group. These 1,3,5-tris(arylamino)benzenes have oxidation potentials in the range of about 0.5-0.6V, excellent reversibility in oxidation-reduction process, high glass transition temperatures and high heat resistance, so that they can form practicable organic semiconductor film readily by a coating method or a vacuum deposition method. In addition, they are capable of forming stable and durable amorphous film useful as high performance organic semiconductors at normal temperatures or higher with no aid of binder resins, that is, by themselves.
    Type: Grant
    Filed: March 15, 2004
    Date of Patent: September 18, 2007
    Assignee: Bando Chemical Industries, Ltd.
    Inventors: Hiroshi Inada, Nobutaka Akashi, Tomoko Hayashi